Turn on Memtest86, set it to test 200x, and then come back in 2 or 3 days. If its going without any errors, give to the grandparents. Otherwise, buy new RAM (return the faulty RAM to the retailer, that's how you get good service). Each individual test can take an hour or two, so 200 end-to-end tests will basically just have the thing spinning forever. But 2 or 3 days worth of RAM tests is probably all you need.

Those memory-configuration stuff is a crapshot anyway. Rely upon the tired-and-true methodology of actually performing QA work yourself. Its a free download and pretty simple to use: https://www.memtest86.com/

For $8 less, the $69 Gigabyte B450 Aorus M looks like a better choice. It has a better arrangement of the PCIe slots, if nothing else.

BeachNut wrote:

$43 2x4 GiB PC4-19200 Corsair Vengeance LPX CMK8GX4M2A2400C16R (DDR4-2400, 16-16-16-39)For the RAM I'd prefer to get G.Skill due to local availability and past good experience but their RAM configurator for this board only lists 16GB+ Why would that be?

It's probably because they have assumed that almost no-one would build a new system and not get at least 16 GiB.

RAM is RAM is RAM. From major companies these days it's very hard to find anything that won't run in some fashion on modern boards/CPUs. Even "picky" CPUs like the first two iterations of Ryzen would happily run Intel-optimized memory at slightly slower speeds.

When going budget for people 99% of the time I go to Newegg and sort by price for a particular set size, then pick the first one that's from a major brand and isn't hideously slow.